Alex Ross on Bruckner 9 4th movement

Yes, the realization is necessarily speculative, especially with regard to the coda, yet Bruckner did a great deal more work on the finale than most people assume. Cohrs, in his notes to the most recent edition, observes that 557 of 647 bars come directly from Bruckner, and only thirteen bars were wholly invented by the editors. (The most common performing edition of Mozart's Requiem, by contrast, is significantly more speculative: nearly a quarter of the score is by Franz Xaver Süssmayr. I have never understood why some conductors happily serve up all that ersatz Mozart while rejecting out of hand the Mahler Tenth or this new Bruckner Ninth.)